dog

1[countable]an animal with four legs and a tail, often kept as a pet or trained for work, for example hunting or guarding buildings. There are many types of dogs, some of which are wildI took the dog for a walk.I could hear a dog barking.dog foodguard dogsa dog and her puppiessee alsoguide dog,gun dog,hearing dog,lapdog,prairie dog,sheepdog

a situation in business, politics, etc. where there is a lot of competition and people are willing to harm each other in order to succeedI'm afraid in this line of work it's a case of dog eat dog.We're operating in a dog-eat-dog world.